package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    //微信服务接口地址
public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    /**
     * 微信用户登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User login(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());
        //判断Openid是否为空，如果为空表示登录失败，抛出业务异常
if (openid == null){
    throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
}
        // 如果不为空则为合法的微信用户，判断当前用户是否为新用户
        User user = userMapper.getByOpenID(openid);
        //如果是新用户则自动完成注册
if (user == null){
   user = User.builder()
            .openid(openid)
            .createTime(LocalDateTime.now())
            .build();
    userMapper.insert(user);
}
        //返回用户对象
        return user;
    }

    private String getOpenid(String code){
        //调用微信接口服务，获得当前微信用户的OpenId
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        /*以上为调取微信接口获取openid*/
        return openid;
    }

}
